[bil-yuh-nair, bil-yuh-nair]
a person who has assets worth a billion or more dollars, francs, pounds, or the like.

1855–60, Americanism; billion + -aire, on the model of millionaire Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
billionaire (ˌbɪljəˈnɛə)
a person whose assets are worth over a billion of the monetary units of his country

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1861, Amer.Eng., from billion on model of millionaire. The first in the U.S. likely was John D. Rockefeller (1839-1937), some time after World War I.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It's the perfect amenity for any billionaire easily bored by old-fashioned
  static images.
My guess is that's what the billionaire who's building hotels in space thinks
The maverick billionaire blogger wants to take the film out of the film
So, with a billionaire's logic, he hired his cardiologist to make a thorough
  search of the science of longevity.
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